/*=============================================================================#
 # Copyright (c) 2009, 2020 Stephan Wahlbrink and others.
 # 
 # This program and the accompanying materials are made available under the
 # terms of the Eclipse Public License 2.0 which is available at
 # https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
 # which is available at https://www.apache.org/licenses/LICENSE-2.0.
 # 
 # SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
 # 
 # Contributors:
 #     Stephan Wahlbrink <sw@wahlbrink.eu> - initial API and implementation
 #=============================================================================*/

package org.eclipse.statet.rj.servi.pool;

import java.net.InetAddress;
import java.net.MalformedURLException;
import java.net.UnknownHostException;
import java.util.Collection;
import java.util.Properties;

import org.eclipse.statet.jcommons.lang.NonNullByDefault;
import org.eclipse.statet.jcommons.lang.Nullable;
import org.eclipse.statet.jcommons.rmi.RMIAddress;

import org.eclipse.statet.internal.rj.servi.Utils;
import org.eclipse.statet.rj.servi.node.PropertiesBean;


@NonNullByDefault
public class NetConfig implements PropertiesBean {
	
	
	public static final String BEAN_ID= "netconfig";
	
	
	public static @Nullable String getPoolAddress(final NetConfig config,
			final String poolId) {
		final String hostAddress;
		final int registryPort;
		synchronized (config) {
			if (!config.validate(null)) {
				return null;
			}
			hostAddress= config.effectiveHostAddress;
			registryPort= config.effectiveRegistryPort;
		}
		return getPoolAddress(hostAddress, registryPort, poolId);
	}
	
	public static @Nullable String getPoolAddress(
			final @Nullable String hostAddress, final int registryPort,
			final String poolId) {
		try {
			return new RMIAddress(hostAddress, registryPort, PoolConfig.getPoolName(poolId))
					.toString();
		}
		catch (final UnknownHostException | MalformedURLException e) {
			return null;
		}
	}
	
	
	public static final String HOSTADDRESS_ID= "host.address";
	public static final String REGISTRY_PORT_ID= "rmi_registry.address.port";
	public static final String REGISTRY_EMBED_ID= "rmi_registry.embed.enabled";
	
	/**
	 * Property id if SSL is enabled
	 * 
	 * @see #setSSLEnabled(boolean)
	 * @since 2.0
	 */
	public static final String SSL_ENABLED_ID= "ssl.enabled";
	
	private static final @Nullable String REGISTRY_HOST_DEFAULT= null;
	private static final int REGISTRY_PORT_DEFAULT= -1;
	private static final boolean REGISTRY_EMBED_DEFAULT= true;
	private static final boolean SSL_ENABLED_DEFAULT= false;
	
	
	private @Nullable String hostAddress;
	private @Nullable String effectiveHostAddress;
	private int registryPort;
	private int effectiveRegistryPort;
	
	private boolean registryEmbed;
	
	private boolean isSSLEnabled;
	
	
	@SuppressWarnings("null")
	public NetConfig() {
		loadDefaults();
	}
	
	@SuppressWarnings("null")
	public NetConfig(final NetConfig config) {
		load(config);
	}
	
	
	@Override
	public String getBeanId() {
		return BEAN_ID;
	}
	
	
	public synchronized void loadDefaults() {
		setHostAddress(REGISTRY_HOST_DEFAULT);
		setRegistryPort(REGISTRY_PORT_DEFAULT);
		setRegistryEmbed(REGISTRY_EMBED_DEFAULT);
		setSSLEnabled(SSL_ENABLED_DEFAULT);
	}
	
	public synchronized void load(final NetConfig templ) {
		setHostAddress(templ.hostAddress);
		setRegistryPort(templ.registryPort);
		setRegistryEmbed(templ.registryEmbed);
		setSSLEnabled(templ.isSSLEnabled);
	}
	
	@Override
	public synchronized void load(final Properties map) {
		loadDefaults();
		
		if (map != null) {
			{	final String s= map.getProperty(HOSTADDRESS_ID);
				if (s != null && !s.isEmpty()) {
					setHostAddress(s);
				}
			}
			{	final String s= map.getProperty(REGISTRY_PORT_ID);
				setRegistryPort((s != null && !s.isEmpty()) ?
						Integer.parseInt(s) : REGISTRY_PORT_DEFAULT );
			}
			{	final String s= map.getProperty(REGISTRY_EMBED_ID);
				setRegistryEmbed((s != null && !s.isEmpty()) ?
						Boolean.parseBoolean(s) : REGISTRY_EMBED_DEFAULT);
			}
			{	final String s= map.getProperty(SSL_ENABLED_ID);
				setSSLEnabled((s != null && !s.isEmpty()) ?
						Boolean.parseBoolean(s) : SSL_ENABLED_DEFAULT);
			}
		}
	}
	
	@Override
	public synchronized void save(final Properties map) {
		Utils.setProperty(map, HOSTADDRESS_ID, this.hostAddress);
		Utils.setProperty(map, REGISTRY_PORT_ID, (this.registryPort > 0) ? Integer.toString(this.registryPort) : null);
		map.put(REGISTRY_EMBED_ID, Boolean.toString(this.registryEmbed));
		map.put(SSL_ENABLED_ID, Boolean.toString(this.isSSLEnabled));
	}
	
	
	public synchronized @Nullable String getHostAddress() {
		return this.hostAddress;
	}
	
	public synchronized void setHostAddress(final @Nullable String address) {
		this.hostAddress= address;
		this.effectiveHostAddress= null;
	}
	
	public synchronized @Nullable String getEffectiveHostAddress() {
		return this.effectiveHostAddress;
	}
	
	public synchronized int getRegistryPort() {
		return this.registryPort;
	}
	
	public synchronized void setRegistryPort(final int port) {
		this.registryPort= port;
		this.effectiveRegistryPort= (port <= 0) ? 1099 : port;
	}
	
	public synchronized int getEffectiveRegistryPort() {
		return this.effectiveRegistryPort;
	}
	
	public synchronized boolean getRegistryEmbed() {
		return this.registryEmbed;
	}
	
	public synchronized void setRegistryEmbed(final boolean embed) {
		this.registryEmbed= embed;
	}
	
	/**
	 * Returns if SSL is enabled
	 * 
	 * @return <code>true</code> if SSL is enabled, otherwise <code>false</code>
	 */
	public synchronized boolean isSSLEnabled() {
		return this.isSSLEnabled;
	}
	
	/**
	 * Sets if SSL is enabled.
	 * 
	 * @param enable
	 * 
	 * @since 2.0
	 */
	public synchronized void setSSLEnabled(final boolean enable) {
		this.isSSLEnabled= enable;
	}
	
	
	@Override
	public synchronized boolean validate(final @Nullable Collection<ValidationMessage> messages) {
		boolean valid= true;
		
		String effective= this.hostAddress;
		if (effective == null || effective.isEmpty()) {
			effective= System.getProperty("java.rmi.server.hostname");
		}
		try {
			InetAddress inet= null;
			if (effective != null && !effective.isEmpty()) {
				inet= InetAddress.getByName(effective);
			}
			else {
				try {
					inet= InetAddress.getLocalHost();
				}
				catch (final UnknownHostException e) {}
				catch (final ArrayIndexOutOfBoundsException e) { /* JVM bug */ }
				if (inet == null) {
					inet= InetAddress.getLoopbackAddress();
				}
			}
			this.effectiveHostAddress= inet.getHostAddress();
		}
		catch (final Exception e) {
			this.effectiveHostAddress= null;
			String msg= e.getMessage();
			if (e instanceof UnknownHostException) {
				msg= "Unknown Host";
			}
			else if (msg == null) {
				msg= e.getClass().getSimpleName();
			}
			if (messages != null) {
				messages.add(new ValidationMessage(HOSTADDRESS_ID, msg));
			}
			valid= false;
		}
		
		return valid;
	}
	
}